Question

A friction clutch is in the form of a frustum of cone. The radius of the ends bring $16$ cm and $10$ cm. Find its curved surface area. The slant height of the friction clutch is $12$ cm.

• A. $302$ $\pi c{m}^2$
• B. $312$ $c{m}^2$
• C. $318$ $c{m}^2$
• D. $312$ $\pi c{m}^2$

Answer 1

Answer: (D)

$312$ $\pi c{m}^2$

Curved surface area = $\pi (R+r)s$
$=\pi (16+10)\times 12$
$=26\pi \times 12$
$=312\pi c{m}^2$